摘要
制备了多壁碳纳米管修饰碳糊电极并研究了锆一茜素红络合物在该电极上的阳极吸附伏安行为，采用二阶导数线性扫描伏安法进行分析，实验结果表明，在0．128mol／L氨基乙酸-0．048mol／L邻苯二甲酸氢钾缓冲液（pH4．0）中，在200mV富集60S，在200～1200mV范围内以200mV／s的速率线性扫描，络合物吸附在该修饰电极表面，于832mV（m．SCE）处产生一个灵敏的氧化峰，为络合物中配体茜素红的氧化所产生。络合物的峰电流与锆的浓度在1．0×10^-11-2．0×10^-7mol／L范围内呈良好的线性关系；检出限（S／N=3）为6．0×10^-12。mol／L（富集时间180S）。方法用于岩矿样品中痕量锆的测定，结果满意。
A novel method for the determination of ultra trace amount of zirconium was described. A multi- wailed carbon nanotube modified carbon paste electrode was prepared and the anodic adsorption voltammetric behavior of the zirconium-alizarin red S （ARS） complex at the modified electrode was investigated. By second derivative linear sweep technique, it was found that in 0. 128 mol/L glycine and 0. 048 mol/L potassium biph- thalate buffer solution （ pH 4.0） , the complex could be adsorbed on the surface of the electrode after accumulating at 200 mV for 60 s, yielding one sensitive oxidation peak at 832 mV （vs. SCE） when scanning linearly from 200 mV to 1200 mV at a scan rate of 200 mV/s,corresponding to the oxidation of ARS in the complex. The peak current of the complex was linear with Zr（ IV ） concentration in the range of 1.0 x 10^-11 _ 2.0 x 10^ -7 mol/L and the detection limit （ S/N= 3 ） was 6.0 x 10 -12 mol/L for 180 s accumulation. The method was applied to the determination of trace zirconium in the ore samples with satisfactory result.
出处
《分析化学》
SCIE
EI
CAS
CSCD
北大核心
2008年第5期691-694,共4页
Chinese Journal of Analytical Chemistry
基金
衡阳市科学技术局科技计划(No.20074J001)
衡阳师范学院科学基金(No.07A19)资助项目
关键词
多壁碳纳米管
化学修饰电极
阳极吸附伏安法
锆
Multi-walled carbon nanotube, chemically modified electrode, anodic adsorption voltammetry,zirconium.
